Washington (CNN) - The bipartisan "Gang of Eight" senators crafting a deal on comprehensive immigration reform, having reached an agreement on all of the major issues, is set to unveil its plan on Tuesday, sources with knowledge of the matter said.

While some small details still need to be ironed out, negotiators were able to find common ground on one of the last significant hurdles - wages and visas for undocumented farm workers, two sources close to the talks confirmed on Friday.